Does anyone sell an inexpensive fertilizer injector for in the line of a
sprinkler system? Something that can be soldered into the copper pipe
coming out of the wall, won't leak, and will siphon up fertilizer-water
mixture from a closed bucket?
Well, it does appear from the illustration that the 'in-line' version is
However, the OP should be open to the likelihood that an adapter (hose
bib or PVC or ???)may need to be soldered in place on her copper line to
allow most modern plumbing accessories to be connected.
I think it COULD be put in front of the 'manifold'(even in front a
spigot) but would still need to have an anti-siphon device anyway - so
likely some additional component would need to be adapted to the copper
anyway. Might be the unnecessarily tricky way to do it. I'm sure it's
do-able, but probably will require an NPT fitting to adapt to PVC.
Either way, it's probably a job for a plumber.
The anti-siphon issue is a HUGE consideration if I understand the OP's
Another thing to be mentioned is how corrosive that water soluble
solution is going to be on copper. I know my hose-bib setup causes
substantial corrosion on all my garden hose brass quick connects
downstream from the injector.
When I put in my underground system, I looked into doing just that.
While there are easy ways, there are some limitations of which you should be
1) The fertilizer will be placed in the pattern of the sprinkler -, e.g.,
circles with the edges a lot more fertilized than close to the head. In
other words - it is not evenly placed.
2) Fertilizer is active salt - it corrodes almost everything, so keep it
away from metal - especially copper and galvanized pipes. So you need to
flush the system by keeping the watering going after feeding
3) most fertilizers used in water are foilar - that is, they feed the
leaves -leaving the roots small. So you don't get the timed release of a
I fed my two eight-station manifolds with a pair of short pieces of 3/4"
hose, put between the the vacuum-breaker-equipped spigot which is fed near
the main, and the manifold. .
When I wanted to feed or treat the grass or flowers in the system, I put
a Miracle-Gro hose-end sprinker in the hose junction (the flared end of the
hose-end feeder screws off and you get a second hose thread). You just
empty the packet into the Miracle-Gro bottle, screw it on, and turn on the
water and the manifold staion to be watered.
(I rarely use it, however.)
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